Cutting and abrading disk



' (No Model.)

' E. B. CALL.

CUTTING AND ABRADING DISK.

No. 270,384. Patented Jan. 9,1883.

tlNITE STATES PATENT OFFICE.

EDWARD B. CALL, OF PEORIA, ILLINOIS CUTTING AND ABRADING DISK.

SPECIFICATION forming part of Letters Patent No. 270,384, dated January9, 1883.

Application filed November 18, 1882.

T 0 all whom tt may concern:

Be it known that I, EDWARD B. CALL, of Peoria, in the county of Peoria,in the State of Illinois, have invented an Improved Cutting and AbradingDisk; and I do hereby declare that the following is a full, clear, andexact description thereof, reference being had to the' annexed drawing,making a part of this specification, in which the figure represents aperspective View of the same.

The object of this invention is the construction of cutting and abradingdisks for dental and mechanical purposes in that line in which a metaldiskhas a gritty powder embedded in its surface. The ordinary modes atpresent for constructing such disks are to impress into the surface ofthe metal disk by direct mechanical pressure the "diamond-dust or otherpowder used, or else by means of a hard steel roller to effect thereby.the embedding of the powder into the disk. I have, however, discoveredin the metal aluminium a peculiar property possessed by no other knownmetal, whereby it is enabled to take up and retain any gritty powder inits surface without the application of pressure.

My process is as follows: I take a freshlyturned disk of aluminium, andwhile it is being revolved rapidly upon its axis hold apiece of emery orcorundum paper against its side, edge, or whatever other part of it- Idesire to have capable of abradin. Instead of the disk being polishedthereby, as would be the case with any other metal having sufficientrigidity for such use, the aluminium picks up and re- (No model.)

tains in its surface a large proportion of the powder composing thecorundnm-paper. In

the case of abrading-plates I first make the surfaces of the samechemically clean, and then simply rub them lightly with a piece ofcorundum- 'iaper.

Although this process is, as has just been shown, a most easy andeconomical mode of forming an abrading-disk, yet this is not its onlyvirtue, as I have found that after once charging it in this way it isalmost impossible to rob it of its grinding property.

jNhat I claim as myinvention, and for which I desire Letters Patent, isas follows, to wit:

1. The herein-described process of forming cutting and abrading disks,said process consisting in rotating a disk ofaluminium in contact withct'n'undum-paper, whereby the co rundnm is taken up by and embedded inthe surface of the said aluminium disk.

2. As an article of manufacture, a cutting or grinding plate formed ofaluminium, having its surface charged with a gritty powder embeddedtherein, substantially as and for the purpose specified.

3. As an article of manufacture, a cutting and abrading disk formedofalumiuium, having a gritty powder embedded in its surface.

In testimony that I claim the foregoing invention [have hereunto set myhand this 15th day of November, 1882.

EDWARD B. CALL.

Witnesses;

H. W. WELLS, RIOHD. A. GOLDSBROUGH.

